We report a girl with an 18p deletion and showing a total GH deficienc
y, a single central maxillary incisor, and a pituitary dysplasis, This
suggests that del(18)(p) could be involved in pituitary dysplasia, We
review the association between midline developmental defects and chro
mosome 18 anomalies. This case is due to a de novo satellite resulting
from an unbalanced translocation t(18p;13p) identified by FISH. This
is the first case of this cytogenetic mechanism in the 18p monosomy.